無法讀取屬性未定義

Question

「/」我開始學習node.js中我問你問題，而學習。當我運行我的代碼（服務器）並連接到本地主機，它不能正常工作。

這是錯誤：

這是我的代碼：

index.js

var server = require('./server'); 
var router = require('./router'); 
var requestHandlers = require('./requestHandlers'); 

var handle = {}; 
handle['/'] = requestHandlers.view; 
handle['/view'] = requestHandlers.view; 
handle['/create'] = requestHandlers.create; 

server.start(router.route, requestHandlers.handle); 

server.js

var http = require('http'); 
var url = require('url'); 

function start(route, handle) { 
    function onRequest(request, response) { 
     var pathname = url.parse(request.url).pathname; 
     console.log('\nrequest for ' + pathname + ' received.'); 

     response.writeHead(200, {'Content-Type' : 'text/plain'}); 
     // route(handle, pathname); // injected function call 
     var content = route(handle, pathname); 

     response.write(content); 
     response.end(); 
    } 

    http.createServer(onRequest).listen(8000); 

    console.log('server has started.'); 
} 

exports.start = start; 

個

router.js

function route(handle, pathname) { 
    console.log('about to route a request for ' + pathname); 
    if (typeof handle[pathname] === 'function') { 
     return handle[pathname](); 
    } else { 
     console.log('no request handler found for ' + pathname); 
     return "404 Not found"; 
    } 
} 

exports.route = route; 

requestHandlers.js

function view(response) { 
    console.log('request handler called --> view'); 
    return "Hello View"; 
} 

function create(response) { 
    console.log('request handler called --> create'); 
    return "Hello Create"; 
} 

exports.view = view; 
exports.create = create; 

Answer 1

在index.js，你傳遞requestHandlers.handle，它不存在，而不是你以前做的handle對象創建。

var server = require('./server'); 
var router = require('./router'); 
var requestHandlers = require('./requestHandlers'); 

var handle = {}; 
handle['/'] = requestHandlers.view; 
handle['/view'] = requestHandlers.view; 
handle['/create'] = requestHandlers.create; 

// server.start(router.route, requestHandlers.handle); 
server.start(router.route, handle);